Revealing the Promotion Effects of Nb on Alkali Resistance of FeVO4/TiO2 Catalysts for NOx Reduction. Issue 17 (14th July 2022)

• Record Type: Journal Article
• Authors: Li, Shuangxi; Hu, Weiwei; Xu, Ziqiang; Yu, Huijun; Lan, Tianwei; Han, Lupeng; Zhang, Dengsong
• Is Part Of: ChemCatChem. Volume 14:Issue 17(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-14
• Subjects: alkali resistance -- environmental catalysis -- heterogeneous catalysis -- NOx reduction -- selective catalytic reduction; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.202200476
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: FeVO4 ‐based catalysts with a wide temperature window and high SO2 tolerance have attracted increasing attention for the selective catalytic reduction of NOx with NH3 . However, the alkali‐resistance of FeVO4 ‐based catalysts is still challenging. In this study, the K‐resistance of FeVO4 /TiO2 was markedly improved via the Nb modification. It was demonstrated that the adsorption and reactivity of NH3 /NH4 + and NOx species on K poisoned FeVO4 /TiO2 both decreased, which restrained the process of Langmuir‐Hinshelwood reaction path. As a comparison, more adsorption of NH3 /NH4 + species and the higher reactivity with gaseous NO maintain the process of Eley‐Rideal reaction path, leading to a satisifactory SCR activity. This work demonstrated an effective route to improve alkali‐resistance via modulating reactivity and reaction path of adsorbed NH3 /NH4 + and NOx species over Nb modified vanadate catalysts, which presented a new point for the development of high‐performance alkali‐resistant SCR catalysts. Abstract : Reaction pathway ? More adsorption of NH3 /NH4 + species and the higher reactivity with gaseous NO maintain the process of E−R reaction path, leading to a satisfactory SCR activity of K poisoned NbFeVOx /TiO2 . Whereas the decreased adsorption and reactivity of NH3 /NH4 + and NOx restrains the process of L−H reaction path, thus showing inferior SCR activity of K poisoned FeVO4 /TiO2 .